Wound sewing-machine bobbin



M. CURRY WOUND SEWING MACHINE BOBBIN Filed Feb. 5. 1926 INVENTOR fl CUR/P y W Y-v ATTORNEYS Patented Nov. 15, 1927.

UNITED STATES PATENT orncs.

MALCOLM CURRY, OI SOABSDALE, NEW YORK, ASSIGNOB TO THE AMERICAN THREAD comm, OI NEW'IYOBK, N. Y., A CORPORATION OF NEW JERSEY.

.WOU'ND snwmo-mcnnm 1301mm.

Application filed l'ebruary 3, 1926. Serial No. 85,671.

My invention relates to new and improved bobbins for use in sewing machines and the like, and has for its object to provide a new and im roved bobbin having and ieces'secured t ereto by adhesive the end pieces covering the ends of the core and not reducing the lnternaldiameter of the core.

The following is,a description of an embodiment of my invention, reference being had to the accompanying drawings, in

which: v

Figure 1 shows in section a core'with a mass of thread thereon to which the end pieces are to be applied;

Fig. 2 shows a central section of the complete bobbin;

Fig. 3 is an end view of the same.

Referring more particular] to' the drawings 2 is a tubular core of car board or other suitable material. 4 is a mass of thread wound universally upon the core. 6 are perforated end pieces of cardboard or other suitable fibrous material which are secured to the tubular core at the ends 8 by adhesive.

26 The perforations in the end pieces are of the same diameter as the internal diameter of the core, so that the and pieces no not overlap or enter the core.

In roducing the bobbin the mass 4' is woun upon the tubular cote 2', the ends of the mass being somewhat curved as at 10. The product thus produced is then subjected to endwise compression which consolidates the mass somewhat and compresses the core so as to cause it to thicken at its ends, as shown at 12, bringing the ends of the core flush with the adjacent ortions of the mass. The perforated end dis s are then applied with sufiicient adhesive to secure the same to the ends of the core only and with the axes of the perforations in line with the axis of the core and subjected to pressure to cause them to conform to the end surfaces of the mass.

Before application, the end pieces are embossed so as to be pre-formed into a concaveconvex shape, as shown in Fig. 2, provided with a flattened zone 14about the orifice, whose inner face lies evenly on the end of the core so as to be easily secured by the adhesive. The elevated portion 16 of the convex surface makes contact with the ends ofv than the radius of the normal curvature of the ends of the mass when wound and also when first compressed and therefore the edges 'of the end pieces, when applied to the core and secured thereto exert a sprin tension upon the peripheries of the en surfaces of the mass so as to prevent the formation of spaces between the mass and the disks in which the thread being unwound ma be liable to enter. The concavo-convex s ape of the end pieces conformin substantially to the curvature of the end pieces of the mass when wound also tends to reduce the liability ofthe end ieces separating from the mass in the comp eted product so as to form such spaces upon an expansion of the mass.

In the roduction of these bobbins I preferably subject the core and mass to the preliminary compression as described so as to not only have the mass compressed but to thicken up the ends of the core and then up ply the end ieces, although the end pieces may be app led before compression, if desired.

As will be evident to those skilled in the art, my invention permits various modifications without departin from the spirit thereof or the scope of the appended claims.

What I claim is:

1. A wound bobbin comprising a tubular core, a mass of. thread wound universally thereon, and perforated end ieces of fibrous material secured by adhesive to the outer ends of said core so as to cover the same, said core being compressed axially and having its end portions thicker than its central portion on account of said compression the perforations in the end pieces being of the same diameter as the internal diameter of the core.

2. A wound bobbin comprising a tubular core, a mass of thread wound universally thereon, and perforated end pieces of fibrous material secured by adhesive to the outer ends of said core, said core being com ressed axially and its end portions thicker t an its central rtion on account of said compres-. sion, 881d. end ieoes' having flattened zones contacting wi the core ends and covering the same, the perforations in the end pieces being of substantially the same diameter as the internal diameter of the core.

In-testimony whereof, I have signed my name to this specification this first day oi February, 1926.

MALCOLM CURRY.

thereon, and perforated end pieces of fibrous material secured by ends of said core, said core being com ressed axially and its end portions thicker. t an its 5 central sion, said end ieces having flattened zones contacting wi the core ends and covering Patent No. 1,648,289.

February, 1926.

MALCOLM CURRY.

adhesive to the outer rtion on account of said compress of Correction; Granted November 15,1927, to

MALCOLM CUIB'RY. It is hereby certified that error appears in the rinted specification oithe abovenumbered patentrequirin correction as follows: age 1, l1 ne 27 for w ordf' mo read do; and that the sai Letters Patent should be read with this correction therein that the same may conform to the recordof the case in the Patent (mice. 'Signed andjea ed this 6th day of December, A; 11.1927. r

otmg C'ommsntm of Patents.

Certificate of Correction.

Patent No. 1,649,289. Granted November 15, 1927, to MALCOLM CURRY.

It is hereby certified that error appears in the Frinted specification of the abovenumbered patent requiring correction as follows: age 1, line 27, for the Word F no read do; and that the said Letters Patent should be read with this correction therein that the same'ma conform to the record of the case in the Patent Ofliee.

Signed and sea ed this 6th day of December, A; D, 1927. r

[m] M. J. MOORE,

Acting Umrtma'saz'om of Pateqts. 

